High Voltage Cable; Solenoid (Gas); Front Display Panel - Dometic NDA1402 Service Manual

5.11 Solenoid
Check the solenoid coil with a properly calibrated Ohm
meter. Remove the connectors from the solenoid and
measure the resistance across the terminals. The proper
reading would be 49 Ohms ± 10%. Failure of the solenoid
is very unlikely. Next, hook up a manometer at the test
port. Then check for DC volts at the gas valve terminals
(Yellow +, White -) while the unit is in trial-for-ignition. If
DC volts are present and the pressure is low, replace the
valve. If DC volts are not present at the valve while the
unit is in trial-for-ignition verify that terminal 2 (yellow wire)
on the 2-pin connector from the ignition control module
has DC volts (8.5 volts or more).

5.12 front display Panel

The display module is the user interface and acts just as a
slave to the power module. It has three buttons and four,
seven-segment LED displays. The left most button is the
ON/OFF button and is directly controlling the power mod-
ule. It has no direct influence on the processor on board.
The button is not actually switching any current, but is
just giving a signal on a separate wire down to the power
module to switch the system "ON" or "OFF". The button in
the middle is the AUTO/STORE button. At normal opera-
tion this button is used to toggle energy selection modes
between AUTO and MANUAL. This button is also used
to store thermostat and clock settings during setting pro-
cedures. If this button is held down during power-up, a
manually initiated defrost will start. The right most but-
ton is the SET button. It is used for thermostat and clock
settings. If this button is held down during power-up, the
service mode will be initiated.
Depressions of the AUTO/STORE and SET buttons are
interpreted by means of the display board processor,
which then sends commands via a serial data bus down
to the power module. The power module processor then
executes the commands. The seven-segment displays
are normally used to show the temperatures in the com-
partments. However, the temperature display may be in-
terleaved by means of flashing with a number of status
or error messages. During setting procedures (thermostat
and clock settings) the displays are used to show setting
information. The "decimal points" are positioned at the top
of the display and these "points" are from left to right used
to indicate PM at clock setting, AUTO mode, AC opera-
tion and GAS operation. The information displayed is con-
trolled from the power module processor. When the fresh
food door is closed, the display is dark. See section 11 for
trouble shooting error codes.
The NDA/NDE 1402 series display cable is identical to
other cables, however the use of the wires are different.
The display panel has no constant 12 volt DC supply and
there is no voltage returning down to the lower control
board. The ON/OFF feature is controlled by a momentary
closing of a separate wire to ground when pressing the
ON/OFF button. The upper display panel is always on,
even if the refrigerator is off and is therefore capable of
sensing the closing to ground.
Pin connections as seen at the lower board.
•
Pin 1, Green- ON/OFF Control (momentary closes
to ground when pressing the ON/OFF button).
•
Pin 2, Not Connected.
•
Pin 3, Black- (+12) volt DC supply to the display
board when the refrigerator is on.
•
Pin 4, Orange- Not Connected.
•
Pin 5, Red- Ground.
•
Pin 6, Brown- Communication Line.
18
Wire colors from top
to bottom:
•
Black
•
Brown
•
Red
•
Orange
•
Green